Detectives believe Cetin acted alone and his motive remains under investigation following the Cascade Mall rampage that left four women and one man dead inside a Macy's department store Friday night.

Trump has fueled a hate-mongering presidential campaign to reform immigration, and if elected, it's feared his administration would blockade refugees from war-torn countries in the Middle East from entering the United States.

It's unclear when Cetin's family left Turkey, a country wedged between Europe and the war-torn Middle East, and his Facebook page states he was born 75 miles west of the Syrian border in Adana.

Cetin is a 2015 graduate of Oak Harbor High School.

Ahmad Rahimi, who was arrested in suspicion of planting explosives in Manhattan and Seaside Park, N.J., following a 48-hour manhunt, was born in Afghanistan, but like Cetin, he moved to the United States as a young child.

Law enforcement officers work at the crime scene outside of Cascade Mall in Burlington. (Dean Rutz/AP)

However, Orlando shooter Omar Mateen was born in New York after his parents emigrated from Afghanistan at some point during the 1980s.

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In the wake of last year's San Bernardino attacks in California, Trump proposed banning all Muslims from entering the U.S. until "our country's representatives can figure out what is going on."

He expanded his pitched ban to countries "compromised by terrorism" in late July.

Just last month, Trump called for a return of "ideological screening," originally designed to weed out communists during the Cold War, to vet migrants from countries "with a history of exporting terrorism."

The FBI said there was no evidence to link the Burlington mall attack with terrorism.

Cetin was captured Sunday night by a pair of Island County Sheriff's Office deputies, one of whom described him as a "zombie."

"He said nothing," said Lt. Mike Hawley.

Jail records show Cetin faces five counts of first-degree murder in the deaths of five people, who have not been officially identified by the Skagit County Coroner.